Zibi - half of this thread gives cryptic clues as to how to open Grandad's Easter Egg chest. I must have posted nearly 70 clues myself
It will only open for people who have not been as good at the game as you I am afraid - you obviously did what I did initially in doing all you can to collect as many points as possible, so well done for that, but I sadly that is your undoing. You will need something spikey to help you out.

Sorry Grandad, I have run out of double-entendres for clues now so bite me and I'll bite back!